Weighing-scale.



No. 789,726. PATENTED MAY 16, 1905. T. A. GRUBBS.

WEIGHING SCALE.

APPLICATION HLED DEO. 2. 1903.

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f/la 2 PATENTED MAY 16, 1905.

T. A. GRUBBS.

WEIGHING SCALE.

APPLIOATION FILED DB0. 2, 190s.

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- UNITED STATES Patented May 16, 1905.

PATENT OFFICE.

THOMAS A. GRUBBS, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOR OF ONE- EIGHTH TO GEORGE P. EOKERT, OF ALLEGHENY, PENNSYLVANIA.

WElGHlNG-SCALE.

SPECIFICATION forming part of Letters Patent N o. 789,726, dated May 16, 1905.

Application filed December 2, 1903. Serial No. 183,449.

.T all whom, it ln/Cty concern:

Be it known that I, THOMAS A. GEUBBs, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Weighing-Scales, of which improvement the following is a specilication.

This invention relates to an improvement 1o in computing weighing-scales and it consists in the certain details of construction and combination of parts, as will be fully described hereinafter.

ln the accompanying drawings, Figure 1 is I5 a face view of a portion of the dial, pointer, and frame of my improved computing-scale, the same being constructed and arranged in accordance with my invention. Fig. 2 is a sectional plan view of the same, the said seczo tion taken through the center of the dial. Fig. 3 is a face View of the spring box or frame located at the rear of the dial, the front portion being removed to show the inner working parts. Fig. 4 is a sectional side 2 5 elevation of the same.

To put my invention into practice, and thereby provide a computing balance-scale, I form from cast metal a frame consisting of an annular disk 1, arranged at the front, provide the same with a glass 2, and secure to the back a spring-box 4. Mounted in a suitable bearing in the frame 1 is a stationary pin or shaft 5, held rigid by a nut 6 and located at the center of the disk of the scale.

3 5 This shaft is iitted with a loose sleeve 7, upon which is fixed a pinion S, arranged inside of the spring-box 4, and the said shaft having attached to its outer end the computing-disk 26, the said disk and pinion adapted to rotate 4o together. Operating in connection with the pinion 8 is a rack 9, arranged in a vertical position and held engaged by means of a roller 14 at the rear. Pivotally connected to the rack-bar is a cross -piece 15, to which springs 16 are attached, the other ends of which being connected to adjusting-rods 17, operated by nuts 1S. Attached to the bar 15 and to the rack 9 is a piece 11 provided at with an eye, to which is attached the handle 5o 13 of the weighing-pan of the scale. Arranged at the rear of the spring-box 4 and integral therewith is a cylinder 20, fitted with a piston 21, a piston-rod 23, and attached to an arm 24, forming a part of the stop 12, the 5 5 said cylinder being provided with perforations 22 at the top for the admission of air into the same. Rigidly attached to the shaft 5 is a thin disk 28, provided at the top with a pointer 29 and with a series of radial open- 6o ings 30, arranged in a vertical line beneath said pointer and corresponding in position. to circular concentric .rows of figures 27, printed in radial lines on the face of the dial 26. This dial 26 is printed with the usual iigures and 65 space marks or dots, indicating the numberof pounds being weighed and the price thereof.

The figures and dots are arranged alternately in said rows. Disk 2S has its said radial series of openings or apertures 30 sepa- 7o rated by intervening strips, which register with the spaces between the said circles or rows of indications on the dial or face member 26.

In the use of a scale constructed and arm ranged as described dial 26 revolves instead of the pointer 29, and as the figures 27, indieating the cost of the material being weighed, are arranged in radial-lines the same may be easily read. The pointer-disk 2S being sta- 8o tionary leaves the indicating-iigures repre senting the number of pounds at all times in a vertical position. The piston 21 will prevent any dancing or vibrating movement of the weighing-pan when a weight or package '8 5 is suddenly placedv thereon.

Having thus described my invention, what T claim, and desire to secure by Letters Pat ent, is*

1. The combination with a casing, a shaft 9o projecting through the wall thereof, a computing-disk loosely mounted on said shaft, a pointer-disk fixed on said shaft in front of said eomputing-disk and being formed with a plurality of openings, a pinion loosely inount- 9 5 ed on said shaft and being rotatable with said Afirst-named disk, a spring-retracted rack its lower end with an enlarged portion 12 and i meshing with the said pinion andaconnection which said last-named means is mounted, a cylinder secured to the rear wall oil the lastnamed casing, a piston operating in said cylinder and being operatively connected to said means, substantially as described.

In testimony whereof I have hereunto signed my name in the presence of two subscribing Witnesses.

THOMAS A. GRUBBS.

In presence Of- JOHN C. THOMPSON, ALEXANDER CARSON. 

